开玩笑测试以验证react-redux操作的返回值

时间:2019-11-21 21:44:30

标签: javascript reactjs redux promise jestjs

我有一个react-redux应用程序,其中希望在发生故障时测试操作的返回值。各个动作创建者的代码如下:

getData: values => async dispatch => {
    dispatch(ACTIONS.getData());
    const result = await values.map(value => {
      const { valueOne } = value;
      return fetchApi(`testURL`)
        .then(data => {
          dispatch(ACTIONS.getDataSuccess(data));
          return data;
        })
        .catch(() => {
          dispatch(
            ACTIONS.getDataError({
              valueOne,
            }),
          );
        });
    });
    return result;
  },

我希望测试此动作创建者,以确保在调用失败时得到“未定义”。这是我这样做的测试代码:

test('getData failure to return [undefined]', async () => {
      fetchApi.mockImplementation(() => Promise.reject('ERROR'));
      const action = DataActions.getData([values[0]]);
      await expectResultsArray(action, [undefined]);
    });

export const expectResultsArray = async (action, expectedResult) => {
  const store = mockStore();
  const result = await store.dispatch(action);
  jestExpect(result).toStrictEqual(expectedResult);
};

由于以下原因,该测试在指定的行(带有符号“>”的行)失败:

expect(received).toStrictEqual(expected) 

    - Expected
    + Received

      Array [
    -   undefined,
    +   Promise {},
      ]

      const store = mockStore();
      const result = await store.dispatch(action);
    > jestExpect(result).toStrictEqual(expectedResult);
      };

该代码有效,运行时将为相应的Promise返回“ undefined”。我在测试中做错了什么?目的是确保调用失败时结果为“ [undefined]”。

0 个答案:

没有答案
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